installing main earth bonding conductors to gas and water services

securespark said:

Is that overhead TN-S? ... Staffordshire was the first place I ever saw overhead TN-S and on the same day, subterranean TT supplies.

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Interesting - I've never heard of such a thing! Where does the DNO 'earth' conductor come from - is there such a conductor run overhead all the way back to the DNO's tranny or is it perhaps derived from rod(s) at local pole(s)?

securespark said:

When you learn about supply types at college, you are generally told TN are underground and TT overhead. Then you go out into the world and find all sorts of variations!

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That was probably true in the past, but things have changed. Many of the rural overhead supplies, like that in my village, which were traditionally TT have now been PMEd, so that they can be used as TN-C-S.

Kind Regards, John

securespark said:

Is that overhead TN-S?

Staffordshire was the first place I ever saw overhead TN-S and on the same day, subterranean TT supplies.

When you learn about supply types at college, you are generally told TN are underground and TT overhead. Then you go out into the world and find all sorts of variations!

Click to expand...

It’s a redhead so likely a BNO supply from a ryefield unit. The SWA termination and single insulated cores isn’t great.

Also I’d be curious to see if the old DNO cutout on the left is still live, and if the supplies which look metallic also need bonding.

So does the earthing cable terminate as per the photo?
I need to know so to leave enough slack on the cable for the spark to fit.
He will need to drill through a wall at some point to run the earthing cable to the gas pipework but the water cables are a piece of cake.
Just going to leave it right there to connect up to. Many thanks

Hoping I can get it all done on a 25m roll. Keep in mind the CU is not at ground level (close to ceiling).